dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  46 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  47 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  48 #define LENGTH(X)               (sizeof X / sizeof X[0])
  49 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  50 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  51 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  52 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  53 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  54 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  55 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  56
  57 /* enums */
  58 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  59 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  60 enum { NetSupported, NetWMName, NetWMState,
  61        NetWMFullscreen, NetLast };                      /* EWMH atoms */
  62 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
  63 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  64        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  65
  66 typedef union {
  67         int i;
  68         unsigned int ui;
  69         float f;
  70         const void *v;
  71 } Arg;
  72
  73 typedef struct {
  74         unsigned int click;
  75         unsigned int mask;
  76         unsigned int button;
  77         void (*func)(const Arg *arg);
  78         const Arg arg;
  79 } Button;
  80
  81 typedef struct Monitor Monitor;
  82 typedef struct Client Client;
  83 struct Client {
  84         char name[256];
  85         float mina, maxa;
  86         int x, y, w, h;
  87         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  88         int bw, oldbw;
  89         unsigned int tags;
  90         Bool isfixed, isfloating, isurgent;
  91         Client *next;
  92         Client *snext;
  93         Monitor *mon;
  94         Window win;
  95 };
  96
  97 typedef struct {
  98         int x, y, w, h;
  99         unsigned long norm[ColLast];
 100         unsigned long sel[ColLast];
 101         Drawable drawable;
 102         GC gc;
 103         struct {
 104                 int ascent;
 105                 int descent;
 106                 int height;
 107                 XFontSet set;
 108                 XFontStruct *xfont;
 109         } font;
 110 } DC; /* draw context */
 111
 112 typedef struct {
 113         unsigned int mod;
 114         KeySym keysym;
 115         void (*func)(const Arg *);
 116         const Arg arg;
 117 } Key;
 118
 119 typedef struct {
 120         const char *symbol;
 121         void (*arrange)(Monitor *);
 122 } Layout;
 123
 124 struct Monitor {
 125         char ltsymbol[16];
 126         float mfact;
 127         int num;
 128         int by;               /* bar geometry */
 129         int mx, my, mw, mh;   /* screen size */
 130         int wx, wy, ww, wh;   /* window area  */
 131         unsigned int seltags;
 132         unsigned int sellt;
 133         unsigned int tagset[2];
 134         Bool showbar;
 135         Bool topbar;
 136         Client *clients;
 137         Client *sel;
 138         Client *stack;
 139         Monitor *next;
 140         Window barwin;
 141         const Layout *lt[2];
 142 };
 143
 144 typedef struct {
 145         const char *class;
 146         const char *instance;
 147         const char *title;
 148         unsigned int tags;
 149         Bool isfloating;
 150         int monitor;
 151 } Rule;
 152
 153 /* function declarations */
 154 static void applyrules(Client *c);
 155 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 156 static void arrange(Monitor *m);
 157 static void arrangemon(Monitor *m);
 158 static void attach(Client *c);
 159 static void attachstack(Client *c);
 160 static void buttonpress(XEvent *e);
 161 static void checkotherwm(void);
 162 static void cleanup(void);
 163 static void cleanupmon(Monitor *mon);
 164 static void clearurgent(Client *c);
 165 static void clientmessage(XEvent *e);
 166 static void configure(Client *c);
 167 static void configurenotify(XEvent *e);
 168 static void configurerequest(XEvent *e);
 169 static Monitor *createmon(void);
 170 static void destroynotify(XEvent *e);
 171 static void detach(Client *c);
 172 static void detachstack(Client *c);
 173 static void die(const char *errstr, ...);
 174 static Monitor *dirtomon(int dir);
 175 static void drawbar(Monitor *m);
 176 static void drawbars(void);
 177 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 178 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 179 static void enternotify(XEvent *e);
 180 static void expose(XEvent *e);
 181 static void focus(Client *c);
 182 static void focusin(XEvent *e);
 183 static void focusmon(const Arg *arg);
 184 static void focusstack(const Arg *arg);
 185 static unsigned long getcolor(const char *colstr);
 186 static Bool getrootptr(int *x, int *y);
 187 static long getstate(Window w);
 188 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 189 static void grabbuttons(Client *c, Bool focused);
 190 static void grabkeys(void);
 191 static void initfont(const char *fontstr);
 192 static Bool isprotodel(Client *c);
 193 static void keypress(XEvent *e);
 194 static void killclient(const Arg *arg);
 195 static void manage(Window w, XWindowAttributes *wa);
 196 static void mappingnotify(XEvent *e);
 197 static void maprequest(XEvent *e);
 198 static void monocle(Monitor *m);
 199 static void movemouse(const Arg *arg);
 200 static Client *nexttiled(Client *c);
 201 static Monitor *ptrtomon(int x, int y);
 202 static void propertynotify(XEvent *e);
 203 static void quit(const Arg *arg);
 204 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 205 static void resizemouse(const Arg *arg);
 206 static void restack(Monitor *m);
 207 static void run(void);
 208 static void scan(void);
 209 static void sendmon(Client *c, Monitor *m);
 210 static void setclientstate(Client *c, long state);
 211 static void setlayout(const Arg *arg);
 212 static void setmfact(const Arg *arg);
 213 static void setup(void);
 214 static void showhide(Client *c);
 215 static void sigchld(int unused);
 216 static void spawn(const Arg *arg);
 217 static void tag(const Arg *arg);
 218 static void tagmon(const Arg *arg);
 219 static int textnw(const char *text, unsigned int len);
 220 static void tile(Monitor *);
 221 static void togglebar(const Arg *arg);
 222 static void togglefloating(const Arg *arg);
 223 static void toggletag(const Arg *arg);
 224 static void toggleview(const Arg *arg);
 225 static void unfocus(Client *c);
 226 static void unmanage(Client *c, Bool destroyed);
 227 static void unmapnotify(XEvent *e);
 228 static Bool updategeom(void);
 229 static void updatebarpos(Monitor *m);
 230 static void updatebars(void);
 231 static void updatenumlockmask(void);
 232 static void updatesizehints(Client *c);
 233 static void updatestatus(void);
 234 static void updatetitle(Client *c);
 235 static void updatewmhints(Client *c);
 236 static void view(const Arg *arg);
 237 static Client *wintoclient(Window w);
 238 static Monitor *wintomon(Window w);
 239 static int xerror(Display *dpy, XErrorEvent *ee);
 240 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 241 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 242 static void zoom(const Arg *arg);
 243
 244 /* variables */
 245 static const char broken[] = "broken";
 246 static char stext[256];
 247 static int screen;
 248 static int sw, sh;           /* X display screen geometry width, height */
 249 static int bh, blw = 0;      /* bar geometry */
 250 static int (*xerrorxlib)(Display *, XErrorEvent *);
 251 static unsigned int numlockmask = 0;
 252 static void (*handler[LASTEvent]) (XEvent *) = {
 253         [ButtonPress] = buttonpress,
 254         [ClientMessage] = clientmessage,
 255         [ConfigureRequest] = configurerequest,
 256         [ConfigureNotify] = configurenotify,
 257         [DestroyNotify] = destroynotify,
 258         [EnterNotify] = enternotify,
 259         [Expose] = expose,
 260         [FocusIn] = focusin,
 261         [KeyPress] = keypress,
 262         [MappingNotify] = mappingnotify,
 263         [MapRequest] = maprequest,
 264         [PropertyNotify] = propertynotify,
 265         [UnmapNotify] = unmapnotify
 266 };
 267 static Atom wmatom[WMLast], netatom[NetLast];
 268 static Bool otherwm;
 269 static Bool running = True;
 270 static Cursor cursor[CurLast];
 271 static Display *dpy;
 272 static DC dc;
 273 static Monitor *mons = NULL, *selmon = NULL;
 274 static Window root;
 275
 276 /* configuration, allows nested code to access above variables */
 277 #include "config.h"
 278
 279 /* compile-time check if all tags fit into an unsigned int bit array. */
 280 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 281
 282 /* function implementations */
 283 void
 284 applyrules(Client *c) {
 285         const char *class, *instance;
 286         unsigned int i;
 287         const Rule *r;
 288         Monitor *m;
 289         XClassHint ch = { 0 };
 290
 291         /* rule matching */
 292         c->isfloating = c->tags = 0;
 293         if(XGetClassHint(dpy, c->win, &ch)) {
 294                 class = ch.res_class ? ch.res_class : broken;
 295                 instance = ch.res_name ? ch.res_name : broken;
 296                 for(i = 0; i < LENGTH(rules); i++) {
 297                         r = &rules[i];
 298                         if((!r->title || strstr(c->name, r->title))
 299                         && (!r->class || strstr(class, r->class))
 300                         && (!r->instance || strstr(instance, r->instance)))
 301                         {
 302                                 c->isfloating = r->isfloating;
 303                                 c->tags |= r->tags;
 304                                 for(m = mons; m && m->num != r->monitor; m = m->next);
 305                                 if(m)
 306                                         c->mon = m;
 307                         }
 308                 }
 309                 if(ch.res_class)
 310                         XFree(ch.res_class);
 311                 if(ch.res_name)
 312                         XFree(ch.res_name);
 313         }
 314         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 315 }
 316
 317 Bool
 318 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 319         Bool baseismin;
 320         Monitor *m = c->mon;
 321
 322         /* set minimum possible */
 323         *w = MAX(1, *w);
 324         *h = MAX(1, *h);
 325         if(interact) {
 326                 if(*x > sw)
 327                         *x = sw - WIDTH(c);
 328                 if(*y > sh)
 329                         *y = sh - HEIGHT(c);
 330                 if(*x + *w + 2 * c->bw < 0)
 331                         *x = 0;
 332                 if(*y + *h + 2 * c->bw < 0)
 333                         *y = 0;
 334         }
 335         else {
 336                 if(*x > m->mx + m->mw)
 337                         *x = m->mx + m->mw - WIDTH(c);
 338                 if(*y > m->my + m->mh)
 339                         *y = m->my + m->mh - HEIGHT(c);
 340                 if(*x + *w + 2 * c->bw < m->mx)
 341                         *x = m->mx;
 342                 if(*y + *h + 2 * c->bw < m->my)
 343                         *y = m->my;
 344         }
 345         if(*h < bh)
 346                 *h = bh;
 347         if(*w < bh)
 348                 *w = bh;
 349         if(resizehints || c->isfloating) {
 350                 /* see last two sentences in ICCCM 4.1.2.3 */
 351                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 352                 if(!baseismin) { /* temporarily remove base dimensions */
 353                         *w -= c->basew;
 354                         *h -= c->baseh;
 355                 }
 356                 /* adjust for aspect limits */
 357                 if(c->mina > 0 && c->maxa > 0) {
 358                         if(c->maxa < (float)*w / *h)
 359                                 *w = *h * c->maxa + 0.5;
 360                         else if(c->mina < (float)*h / *w)
 361                                 *h = *w * c->mina + 0.5;
 362                 }
 363                 if(baseismin) { /* increment calculation requires this */
 364                         *w -= c->basew;
 365                         *h -= c->baseh;
 366                 }
 367                 /* adjust for increment value */
 368                 if(c->incw)
 369                         *w -= *w % c->incw;
 370                 if(c->inch)
 371                         *h -= *h % c->inch;
 372                 /* restore base dimensions */
 373                 *w += c->basew;
 374                 *h += c->baseh;
 375                 *w = MAX(*w, c->minw);
 376                 *h = MAX(*h, c->minh);
 377                 if(c->maxw)
 378                         *w = MIN(*w, c->maxw);
 379                 if(c->maxh)
 380                         *h = MIN(*h, c->maxh);
 381         }
 382         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 383 }
 384
 385 void
 386 arrange(Monitor *m) {
 387         if(m)
 388                 showhide(m->stack);
 389         else for(m = mons; m; m = m->next)
 390                 showhide(m->stack);
 391         focus(NULL);
 392         if(m)
 393                 arrangemon(m);
 394         else for(m = mons; m; m = m->next)
 395                 arrangemon(m);
 396 }
 397
 398 void
 399 arrangemon(Monitor *m) {
 400         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 401         if(m->lt[m->sellt]->arrange)
 402                 m->lt[m->sellt]->arrange(m);
 403         restack(m);
 404 }
 405
 406 void
 407 attach(Client *c) {
 408         c->next = c->mon->clients;
 409         c->mon->clients = c;
 410 }
 411
 412 void
 413 attachstack(Client *c) {
 414         c->snext = c->mon->stack;
 415         c->mon->stack = c;
 416 }
 417
 418 void
 419 buttonpress(XEvent *e) {
 420         unsigned int i, x, click;
 421         Arg arg = {0};
 422         Client *c;
 423         Monitor *m;
 424         XButtonPressedEvent *ev = &e->xbutton;
 425
 426         click = ClkRootWin;
 427         /* focus monitor if necessary */
 428         if((m = wintomon(ev->window)) && m != selmon) {
 429                 unfocus(selmon->sel);
 430                 selmon = m;
 431                 focus(NULL);
 432         }
 433         if(ev->window == selmon->barwin) {
 434                 i = x = 0;
 435                 do {
 436                         x += TEXTW(tags[i]);
 437                 } while(ev->x >= x && ++i < LENGTH(tags));
 438                 if(i < LENGTH(tags)) {
 439                         click = ClkTagBar;
 440                         arg.ui = 1 << i;
 441                 }
 442                 else if(ev->x < x + blw)
 443                         click = ClkLtSymbol;
 444                 else if(ev->x > selmon->wx + selmon->ww - TEXTW(stext))
 445                         click = ClkStatusText;
 446                 else
 447                         click = ClkWinTitle;
 448         }
 449         else if((c = wintoclient(ev->window))) {
 450                 focus(c);
 451                 click = ClkClientWin;
 452         }
 453         for(i = 0; i < LENGTH(buttons); i++)
 454                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 455                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 456                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 457 }
 458
 459 void
 460 checkotherwm(void) {
 461         otherwm = False;
 462         xerrorxlib = XSetErrorHandler(xerrorstart);
 463         /* this causes an error if some other window manager is running */
 464         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 465         XSync(dpy, False);
 466         if(otherwm)
 467                 die("dwm: another window manager is already running\n");
 468         XSetErrorHandler(xerror);
 469         XSync(dpy, False);
 470 }
 471
 472 void
 473 cleanup(void) {
 474         Arg a = {.ui = ~0};
 475         Layout foo = { "", NULL };
 476         Monitor *m;
 477
 478         view(&a);
 479         selmon->lt[selmon->sellt] = &foo;
 480         for(m = mons; m; m = m->next)
 481                 while(m->stack)
 482                         unmanage(m->stack, False);
 483         if(dc.font.set)
 484                 XFreeFontSet(dpy, dc.font.set);
 485         else
 486                 XFreeFont(dpy, dc.font.xfont);
 487         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 488         XFreePixmap(dpy, dc.drawable);
 489         XFreeGC(dpy, dc.gc);
 490         XFreeCursor(dpy, cursor[CurNormal]);
 491         XFreeCursor(dpy, cursor[CurResize]);
 492         XFreeCursor(dpy, cursor[CurMove]);
 493         while(mons)
 494                 cleanupmon(mons);
 495         XSync(dpy, False);
 496         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 497 }
 498
 499 void
 500 cleanupmon(Monitor *mon) {
 501         Monitor *m;
 502
 503         if(mon == mons)
 504                 mons = mons->next;
 505         else {
 506                 for(m = mons; m && m->next != mon; m = m->next);
 507                 m->next = mon->next;
 508         }
 509         XUnmapWindow(dpy, mon->barwin);
 510         XDestroyWindow(dpy, mon->barwin);
 511         free(mon);
 512 }
 513
 514 void
 515 clearurgent(Client *c) {
 516         XWMHints *wmh;
 517
 518         c->isurgent = False;
 519         if(!(wmh = XGetWMHints(dpy, c->win)))
 520                 return;
 521         wmh->flags &= ~XUrgencyHint;
 522         XSetWMHints(dpy, c->win, wmh);
 523         XFree(wmh);
 524 }
 525
 526 void
 527 configure(Client *c) {
 528         XConfigureEvent ce;
 529
 530         ce.type = ConfigureNotify;
 531         ce.display = dpy;
 532         ce.event = c->win;
 533         ce.window = c->win;
 534         ce.x = c->x;
 535         ce.y = c->y;
 536         ce.width = c->w;
 537         ce.height = c->h;
 538         ce.border_width = c->bw;
 539         ce.above = None;
 540         ce.override_redirect = False;
 541         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 542 }
 543
 544 void
 545 configurenotify(XEvent *e) {
 546         Monitor *m;
 547         XConfigureEvent *ev = &e->xconfigure;
 548
 549         if(ev->window == root) {
 550                 sw = ev->width;
 551                 sh = ev->height;
 552                 if(updategeom()) {
 553                         if(dc.drawable != 0)
 554                                 XFreePixmap(dpy, dc.drawable);
 555                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 556                         updatebars();
 557                         for(m = mons; m; m = m->next)
 558                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 559                         arrange(NULL);
 560                 }
 561         }
 562 }
 563
 564 void
 565 configurerequest(XEvent *e) {
 566         Client *c;
 567         Monitor *m;
 568         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 569         XWindowChanges wc;
 570
 571         if((c = wintoclient(ev->window))) {
 572                 if(ev->value_mask & CWBorderWidth)
 573                         c->bw = ev->border_width;
 574                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 575                         m = c->mon;
 576                         if(ev->value_mask & CWX)
 577                                 c->x = m->mx + ev->x;
 578                         if(ev->value_mask & CWY)
 579                                 c->y = m->my + ev->y;
 580                         if(ev->value_mask & CWWidth)
 581                                 c->w = ev->width;
 582                         if(ev->value_mask & CWHeight)
 583                                 c->h = ev->height;
 584                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 585                                 c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 586                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 587                                 c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 588                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 589                                 configure(c);
 590                         if(ISVISIBLE(c))
 591                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 592                 }
 593                 else
 594                         configure(c);
 595         }
 596         else {
 597                 wc.x = ev->x;
 598                 wc.y = ev->y;
 599                 wc.width = ev->width;
 600                 wc.height = ev->height;
 601                 wc.border_width = ev->border_width;
 602                 wc.sibling = ev->above;
 603                 wc.stack_mode = ev->detail;
 604                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 605         }
 606         XSync(dpy, False);
 607 }
 608
 609 Monitor *
 610 createmon(void) {
 611         Monitor *m;
 612
 613         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 614                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 615         m->tagset[0] = m->tagset[1] = 1;
 616         m->mfact = mfact;
 617         m->showbar = showbar;
 618         m->topbar = topbar;
 619         m->lt[0] = &layouts[0];
 620         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 621         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 622         return m;
 623 }
 624
 625 void
 626 destroynotify(XEvent *e) {
 627         Client *c;
 628         XDestroyWindowEvent *ev = &e->xdestroywindow;
 629
 630         if((c = wintoclient(ev->window)))
 631                 unmanage(c, True);
 632 }
 633
 634 void
 635 detach(Client *c) {
 636         Client **tc;
 637
 638         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 639         *tc = c->next;
 640 }
 641
 642 void
 643 detachstack(Client *c) {
 644         Client **tc, *t;
 645
 646         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 647         *tc = c->snext;
 648
 649         if(c == c->mon->sel) {
 650                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 651                 c->mon->sel = t;
 652         }
 653 }
 654
 655 void
 656 die(const char *errstr, ...) {
 657         va_list ap;
 658
 659         va_start(ap, errstr);
 660         vfprintf(stderr, errstr, ap);
 661         va_end(ap);
 662         exit(EXIT_FAILURE);
 663 }
 664
 665 Monitor *
 666 dirtomon(int dir) {
 667         Monitor *m = NULL;
 668
 669         if(dir > 0) {
 670                 if(!(m = selmon->next))
 671                         m = mons;
 672         }
 673         else {
 674                 if(selmon == mons)
 675                         for(m = mons; m->next; m = m->next);
 676                 else
 677                         for(m = mons; m->next != selmon; m = m->next);
 678         }
 679         return m;
 680 }
 681
 682 void
 683 drawbar(Monitor *m) {
 684         int x;
 685         unsigned int i, occ = 0, urg = 0;
 686         unsigned long *col;
 687         Client *c;
 688
 689         for(c = m->clients; c; c = c->next) {
 690                 occ |= c->tags;
 691                 if(c->isurgent)
 692                         urg |= c->tags;
 693         }
 694         dc.x = 0;
 695         for(i = 0; i < LENGTH(tags); i++) {
 696                 dc.w = TEXTW(tags[i]);
 697                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 698                 drawtext(tags[i], col, urg & 1 << i);
 699                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 700                            occ & 1 << i, urg & 1 << i, col);
 701                 dc.x += dc.w;
 702         }
 703         dc.w = blw = TEXTW(m->ltsymbol);
 704         drawtext(m->ltsymbol, dc.norm, False);
 705         dc.x += dc.w;
 706         x = dc.x;
 707         if(m == selmon) { /* status is only drawn on selected monitor */
 708                 dc.w = TEXTW(stext);
 709                 dc.x = m->ww - dc.w;
 710                 if(dc.x < x) {
 711                         dc.x = x;
 712                         dc.w = m->ww - x;
 713                 }
 714                 drawtext(stext, dc.norm, False);
 715         }
 716         else
 717                 dc.x = m->ww;
 718         if((dc.w = dc.x - x) > bh) {
 719                 dc.x = x;
 720                 if(m->sel) {
 721                         col = m == selmon ? dc.sel : dc.norm;
 722                         drawtext(m->sel->name, col, False);
 723                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 724                 }
 725                 else
 726                         drawtext(NULL, dc.norm, False);
 727         }
 728         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 729         XSync(dpy, False);
 730 }
 731
 732 void
 733 drawbars(void) {
 734         Monitor *m;
 735
 736         for(m = mons; m; m = m->next)
 737                 drawbar(m);
 738 }
 739
 740 void
 741 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 742         int x;
 743         XGCValues gcv;
 744         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 745
 746         gcv.foreground = col[invert ? ColBG : ColFG];
 747         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 748         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 749         r.x = dc.x + 1;
 750         r.y = dc.y + 1;
 751         if(filled) {
 752                 r.width = r.height = x + 1;
 753                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 754         }
 755         else if(empty) {
 756                 r.width = r.height = x;
 757                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 758         }
 759 }
 760
 761 void
 762 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 763         char buf[256];
 764         int i, x, y, h, len, olen;
 765         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 766
 767         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 768         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 769         if(!text)
 770                 return;
 771         olen = strlen(text);
 772         h = dc.font.ascent + dc.font.descent;
 773         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 774         x = dc.x + (h / 2);
 775         /* shorten text if necessary */
 776         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 777         if(!len)
 778                 return;
 779         memcpy(buf, text, len);
 780         if(len < olen)
 781                 for(i = len; i && i > len - 3; buf[--i] = '.');
 782         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 783         if(dc.font.set)
 784                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 785         else
 786                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 787 }
 788
 789 void
 790 enternotify(XEvent *e) {
 791         Client *c;
 792         Monitor *m;
 793         XCrossingEvent *ev = &e->xcrossing;
 794
 795         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 796                 return;
 797         if((m = wintomon(ev->window)) && m != selmon) {
 798                 unfocus(selmon->sel);
 799                 selmon = m;
 800         }
 801         if((c = wintoclient(ev->window)))
 802                 focus(c);
 803         else
 804                 focus(NULL);
 805 }
 806
 807 void
 808 expose(XEvent *e) {
 809         Monitor *m;
 810         XExposeEvent *ev = &e->xexpose;
 811
 812         if(ev->count == 0 && (m = wintomon(ev->window)))
 813                 drawbar(m);
 814 }
 815
 816 void
 817 focus(Client *c) {
 818         if(!c || !ISVISIBLE(c))
 819                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 820         if(selmon->sel)
 821                 unfocus(selmon->sel);
 822         if(c) {
 823                 if(c->mon != selmon)
 824                         selmon = c->mon;
 825                 if(c->isurgent)
 826                         clearurgent(c);
 827                 detachstack(c);
 828                 attachstack(c);
 829                 grabbuttons(c, True);
 830                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 831                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 832         }
 833         else
 834                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 835         selmon->sel = c;
 836         drawbars();
 837 }
 838
 839 void
 840 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 841         XFocusChangeEvent *ev = &e->xfocus;
 842
 843         if(selmon->sel && ev->window != selmon->sel->win)
 844                 XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 845 }
 846
 847 void
 848 focusmon(const Arg *arg) {
 849         Monitor *m = NULL;
 850
 851         if(!mons->next)
 852                 return;
 853         if((m = dirtomon(arg->i)) == selmon)
 854                 return;
 855         unfocus(selmon->sel);
 856         selmon = m;
 857         focus(NULL);
 858 }
 859
 860 void
 861 focusstack(const Arg *arg) {
 862         Client *c = NULL, *i;
 863
 864         if(!selmon->sel)
 865                 return;
 866         if(arg->i > 0) {
 867                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 868                 if(!c)
 869                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 870         }
 871         else {
 872                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 873                         if(ISVISIBLE(i))
 874                                 c = i;
 875                 if(!c)
 876                         for(; i; i = i->next)
 877                                 if(ISVISIBLE(i))
 878                                         c = i;
 879         }
 880         if(c) {
 881                 focus(c);
 882                 restack(selmon);
 883         }
 884 }
 885
 886 unsigned long
 887 getcolor(const char *colstr) {
 888         Colormap cmap = DefaultColormap(dpy, screen);
 889         XColor color;
 890
 891         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 892                 die("error, cannot allocate color '%s'\n", colstr);
 893         return color.pixel;
 894 }
 895
 896 Bool
 897 getrootptr(int *x, int *y) {
 898         int di;
 899         unsigned int dui;
 900         Window dummy;
 901
 902         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 903 }
 904
 905 long
 906 getstate(Window w) {
 907         int format, status;
 908         long result = -1;
 909         unsigned char *p = NULL;
 910         unsigned long n, extra;
 911         Atom real;
 912
 913         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 914                                     &real, &format, &n, &extra, (unsigned char **)&p);
 915         if(status != Success)
 916                 return -1;
 917         if(n != 0)
 918                 result = *p;
 919         XFree(p);
 920         return result;
 921 }
 922
 923 Bool
 924 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 925         char **list = NULL;
 926         int n;
 927         XTextProperty name;
 928
 929         if(!text || size == 0)
 930                 return False;
 931         text[0] = '\0';
 932         XGetTextProperty(dpy, w, &name, atom);
 933         if(!name.nitems)
 934                 return False;
 935         if(name.encoding == XA_STRING)
 936                 strncpy(text, (char *)name.value, size - 1);
 937         else {
 938                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 939                         strncpy(text, *list, size - 1);
 940                         XFreeStringList(list);
 941                 }
 942         }
 943         text[size - 1] = '\0';
 944         XFree(name.value);
 945         return True;
 946 }
 947
 948 void
 949 grabbuttons(Client *c, Bool focused) {
 950         updatenumlockmask();
 951         {
 952                 unsigned int i, j;
 953                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 954                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 955                 if(focused) {
 956                         for(i = 0; i < LENGTH(buttons); i++)
 957                                 if(buttons[i].click == ClkClientWin)
 958                                         for(j = 0; j < LENGTH(modifiers); j++)
 959                                                 XGrabButton(dpy, buttons[i].button,
 960                                                             buttons[i].mask | modifiers[j],
 961                                                             c->win, False, BUTTONMASK,
 962                                                             GrabModeAsync, GrabModeSync, None, None);
 963                 }
 964                 else
 965                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 966                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 967         }
 968 }
 969
 970 void
 971 grabkeys(void) {
 972         updatenumlockmask();
 973         {
 974                 unsigned int i, j;
 975                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 976                 KeyCode code;
 977
 978                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 979                 for(i = 0; i < LENGTH(keys); i++) {
 980                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 981                                 for(j = 0; j < LENGTH(modifiers); j++)
 982                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 983                                                  True, GrabModeAsync, GrabModeAsync);
 984                 }
 985         }
 986 }
 987
 988 void
 989 initfont(const char *fontstr) {
 990         char *def, **missing;
 991         int i, n;
 992
 993         missing = NULL;
 994         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 995         if(missing) {
 996                 while(n--)
 997                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 998                 XFreeStringList(missing);
 999         }
1000         if(dc.font.set) {
1001                 XFontSetExtents *font_extents;
1002                 XFontStruct **xfonts;
1003                 char **font_names;
1004
1005                 dc.font.ascent = dc.font.descent = 0;
1006                 font_extents = XExtentsOfFontSet(dc.font.set);
1007                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1008                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
1009                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1010                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1011                         xfonts++;
1012                 }
1013         }
1014         else {
1015                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1016                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1017                         die("error, cannot load font: '%s'\n", fontstr);
1018                 dc.font.ascent = dc.font.xfont->ascent;
1019                 dc.font.descent = dc.font.xfont->descent;
1020         }
1021         dc.font.height = dc.font.ascent + dc.font.descent;
1022 }
1023
1024 Bool
1025 isprotodel(Client *c) {
1026         int i, n;
1027         Atom *protocols;
1028         Bool ret = False;
1029
1030         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1031                 for(i = 0; !ret && i < n; i++)
1032                         if(protocols[i] == wmatom[WMDelete])
1033                                 ret = True;
1034                 XFree(protocols);
1035         }
1036         return ret;
1037 }
1038
1039 #ifdef XINERAMA
1040 static Bool
1041 isuniquegeom(XineramaScreenInfo *unique, size_t len, XineramaScreenInfo *info) {
1042         unsigned int i;
1043
1044         for(i = 0; i < len; i++)
1045                 if(unique[i].x_org == info->x_org && unique[i].y_org == info->y_org
1046                 && unique[i].width == info->width && unique[i].height == info->height)
1047                         return False;
1048         return True;
1049 }
1050 #endif /* XINERAMA */
1051
1052 void
1053 keypress(XEvent *e) {
1054         unsigned int i;
1055         KeySym keysym;
1056         XKeyEvent *ev;
1057
1058         ev = &e->xkey;
1059         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1060         for(i = 0; i < LENGTH(keys); i++)
1061                 if(keysym == keys[i].keysym
1062                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1063                 && keys[i].func)
1064                         keys[i].func(&(keys[i].arg));
1065 }
1066
1067 void
1068 killclient(const Arg *arg) {
1069         XEvent ev;
1070
1071         if(!selmon->sel)
1072                 return;
1073         if(isprotodel(selmon->sel)) {
1074                 ev.type = ClientMessage;
1075                 ev.xclient.window = selmon->sel->win;
1076                 ev.xclient.message_type = wmatom[WMProtocols];
1077                 ev.xclient.format = 32;
1078                 ev.xclient.data.l[0] = wmatom[WMDelete];
1079                 ev.xclient.data.l[1] = CurrentTime;
1080                 XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1081         }
1082         else {
1083                 XGrabServer(dpy);
1084                 XSetErrorHandler(xerrordummy);
1085                 XSetCloseDownMode(dpy, DestroyAll);
1086                 XKillClient(dpy, selmon->sel->win);
1087                 XSync(dpy, False);
1088                 XSetErrorHandler(xerror);
1089                 XUngrabServer(dpy);
1090         }
1091 }
1092
1093 void
1094 manage(Window w, XWindowAttributes *wa) {
1095         static Client cz;
1096         Client *c, *t = NULL;
1097         Window trans = None;
1098         XWindowChanges wc;
1099
1100         if(!(c = malloc(sizeof(Client))))
1101                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1102         *c = cz;
1103         c->win = w;
1104         updatetitle(c);
1105         if(XGetTransientForHint(dpy, w, &trans))
1106                 t = wintoclient(trans);
1107         if(t) {
1108                 c->mon = t->mon;
1109                 c->tags = t->tags;
1110         }
1111         else {
1112                 c->mon = selmon;
1113                 applyrules(c);
1114         }
1115         /* geometry */
1116         c->x = wa->x + c->mon->wx;
1117         c->y = wa->y + c->mon->wy;
1118         c->w = wa->width;
1119         c->h = wa->height;
1120         c->oldbw = wa->border_width;
1121         if(c->w == c->mon->mw && c->h == c->mon->mh) {
1122                 c->x = c->mon->mx;
1123                 c->y = c->mon->my;
1124                 c->bw = 0;
1125         }
1126         else {
1127                 if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1128                         c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1129                 if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1130                         c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1131                 c->x = MAX(c->x, c->mon->mx);
1132                 /* only fix client y-offset, if the client center might cover the bar */
1133                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1134                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1135                 c->bw = borderpx;
1136         }
1137         wc.border_width = c->bw;
1138         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1139         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1140         configure(c); /* propagates border_width, if size doesn't change */
1141         updatesizehints(c);
1142         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1143         grabbuttons(c, False);
1144         if(!c->isfloating)
1145                 c->isfloating = trans != None || c->isfixed;
1146         if(c->isfloating)
1147                 XRaiseWindow(dpy, c->win);
1148         attach(c);
1149         attachstack(c);
1150         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1151         XMapWindow(dpy, c->win);
1152         setclientstate(c, NormalState);
1153         arrange(c->mon);
1154 }
1155
1156 void
1157 mappingnotify(XEvent *e) {
1158         XMappingEvent *ev = &e->xmapping;
1159
1160         XRefreshKeyboardMapping(ev);
1161         if(ev->request == MappingKeyboard)
1162                 grabkeys();
1163 }
1164
1165 void
1166 maprequest(XEvent *e) {
1167         static XWindowAttributes wa;
1168         XMapRequestEvent *ev = &e->xmaprequest;
1169
1170         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1171                 return;
1172         if(wa.override_redirect)
1173                 return;
1174         if(!wintoclient(ev->window))
1175                 manage(ev->window, &wa);
1176 }
1177
1178 void
1179 monocle(Monitor *m) {
1180         unsigned int n = 0;
1181         Client *c;
1182
1183         for(c = m->clients; c; c = c->next)
1184                 if(ISVISIBLE(c))
1185                         n++;
1186         if(n > 0) /* override layout symbol */
1187                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1188         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1189                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1190 }
1191
1192 void
1193 movemouse(const Arg *arg) {
1194         int x, y, ocx, ocy, nx, ny;
1195         Client *c;
1196         Monitor *m;
1197         XEvent ev;
1198
1199         if(!(c = selmon->sel))
1200                 return;
1201         restack(selmon);
1202         ocx = c->x;
1203         ocy = c->y;
1204         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1205         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1206                 return;
1207         if(!getrootptr(&x, &y))
1208                 return;
1209         do {
1210                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1211                 switch (ev.type) {
1212                 case ConfigureRequest:
1213                 case Expose:
1214                 case MapRequest:
1215                         handler[ev.type](&ev);
1216                         break;
1217                 case MotionNotify:
1218                         nx = ocx + (ev.xmotion.x - x);
1219                         ny = ocy + (ev.xmotion.y - y);
1220                         if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1221                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1222                                 if(abs(selmon->wx - nx) < snap)
1223                                         nx = selmon->wx;
1224                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1225                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1226                                 if(abs(selmon->wy - ny) < snap)
1227                                         ny = selmon->wy;
1228                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1229                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1230                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1231                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1232                                         togglefloating(NULL);
1233                         }
1234                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1235                                 resize(c, nx, ny, c->w, c->h, True);
1236                         break;
1237                 }
1238         } while(ev.type != ButtonRelease);
1239         XUngrabPointer(dpy, CurrentTime);
1240         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1241                 sendmon(c, m);
1242                 selmon = m;
1243                 focus(NULL);
1244         }
1245 }
1246
1247 Client *
1248 nexttiled(Client *c) {
1249         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1250         return c;
1251 }
1252
1253 Monitor *
1254 ptrtomon(int x, int y) {
1255         Monitor *m;
1256
1257         for(m = mons; m; m = m->next)
1258                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1259                         return m;
1260         return selmon;
1261 }
1262
1263 void
1264 propertynotify(XEvent *e) {
1265         Client *c;
1266         Window trans;
1267         XPropertyEvent *ev = &e->xproperty;
1268
1269         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1270                 updatestatus();
1271         else if(ev->state == PropertyDelete)
1272                 return; /* ignore */
1273         else if((c = wintoclient(ev->window))) {
1274                 switch (ev->atom) {
1275                 default: break;
1276                 case XA_WM_TRANSIENT_FOR:
1277                         XGetTransientForHint(dpy, c->win, &trans);
1278                         if(!c->isfloating && (c->isfloating = (wintoclient(trans) != NULL)))
1279                                 arrange(c->mon);
1280                         break;
1281                 case XA_WM_NORMAL_HINTS:
1282                         updatesizehints(c);
1283                         break;
1284                 case XA_WM_HINTS:
1285                         updatewmhints(c);
1286                         drawbars();
1287                         break;
1288                 }
1289                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1290                         updatetitle(c);
1291                         if(c == c->mon->sel)
1292                                 drawbar(c->mon);
1293                 }
1294         }
1295 }
1296
1297 void
1298 clientmessage(XEvent *e) {
1299         XClientMessageEvent *cme = &e->xclient;
1300
1301         if(cme->message_type == netatom[NetWMState] && cme->data.l[1] == netatom[NetWMFullscreen]) {
1302                 if(cme->data.l[0])
1303                         XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32,
1304                                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1305                 else
1306                         XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32,
1307                                         PropModeReplace, (unsigned char*)0, 0);
1308         }
1309 }
1310
1311 void
1312 quit(const Arg *arg) {
1313         running = False;
1314 }
1315
1316 void
1317 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1318         XWindowChanges wc;
1319
1320         if(applysizehints(c, &x, &y, &w, &h, interact)) {
1321                 c->x = wc.x = x;
1322                 c->y = wc.y = y;
1323                 c->w = wc.width = w;
1324                 c->h = wc.height = h;
1325                 wc.border_width = c->bw;
1326                 XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1327                 configure(c);
1328                 XSync(dpy, False);
1329         }
1330 }
1331
1332 void
1333 resizemouse(const Arg *arg) {
1334         int ocx, ocy;
1335         int nw, nh;
1336         Client *c;
1337         Monitor *m;
1338         XEvent ev;
1339
1340         if(!(c = selmon->sel))
1341                 return;
1342         restack(selmon);
1343         ocx = c->x;
1344         ocy = c->y;
1345         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1346                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1347                 return;
1348         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1349         do {
1350                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1351                 switch(ev.type) {
1352                 case ConfigureRequest:
1353                 case Expose:
1354                 case MapRequest:
1355                         handler[ev.type](&ev);
1356                         break;
1357                 case MotionNotify:
1358                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1359                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1360                         if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1361                         && nh >= selmon->wy && nh <= selmon->wy + selmon->wh)
1362                         {
1363                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1364                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1365                                         togglefloating(NULL);
1366                         }
1367                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1368                                 resize(c, c->x, c->y, nw, nh, True);
1369                         break;
1370                 }
1371         } while(ev.type != ButtonRelease);
1372         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1373         XUngrabPointer(dpy, CurrentTime);
1374         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1375         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1376                 sendmon(c, m);
1377                 selmon = m;
1378                 focus(NULL);
1379         }
1380 }
1381
1382 void
1383 restack(Monitor *m) {
1384         Client *c;
1385         XEvent ev;
1386         XWindowChanges wc;
1387
1388         drawbar(m);
1389         if(!m->sel)
1390                 return;
1391         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1392                 XRaiseWindow(dpy, m->sel->win);
1393         if(m->lt[m->sellt]->arrange) {
1394                 wc.stack_mode = Below;
1395                 wc.sibling = m->barwin;
1396                 for(c = m->stack; c; c = c->snext)
1397                         if(!c->isfloating && ISVISIBLE(c)) {
1398                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1399                                 wc.sibling = c->win;
1400                         }
1401         }
1402         XSync(dpy, False);
1403         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1404 }
1405
1406 void
1407 run(void) {
1408         XEvent ev;
1409         /* main event loop */
1410         XSync(dpy, False);
1411         while(running && !XNextEvent(dpy, &ev)) {
1412                 if(handler[ev.type])
1413                         handler[ev.type](&ev); /* call handler */
1414         }
1415 }
1416
1417 void
1418 scan(void) {
1419         unsigned int i, num;
1420         Window d1, d2, *wins = NULL;
1421         XWindowAttributes wa;
1422
1423         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1424                 for(i = 0; i < num; i++) {
1425                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1426                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1427                                 continue;
1428                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1429                                 manage(wins[i], &wa);
1430                 }
1431                 for(i = 0; i < num; i++) { /* now the transients */
1432                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1433                                 continue;
1434                         if(XGetTransientForHint(dpy, wins[i], &d1)
1435                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1436                                 manage(wins[i], &wa);
1437                 }
1438                 if(wins)
1439                         XFree(wins);
1440         }
1441 }
1442
1443 void
1444 sendmon(Client *c, Monitor *m) {
1445         if(c->mon == m)
1446                 return;
1447         unfocus(c);
1448         detach(c);
1449         detachstack(c);
1450         c->mon = m;
1451         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1452         attach(c);
1453         attachstack(c);
1454         focus(NULL);
1455         arrange(NULL);
1456 }
1457
1458 void
1459 setclientstate(Client *c, long state) {
1460         long data[] = { state, None };
1461
1462         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1463                         PropModeReplace, (unsigned char *)data, 2);
1464 }
1465
1466 void
1467 setlayout(const Arg *arg) {
1468         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1469                 selmon->sellt ^= 1;
1470         if(arg && arg->v)
1471                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1472         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1473         if(selmon->sel)
1474                 arrange(selmon);
1475         else
1476                 drawbar(selmon);
1477 }
1478
1479 /* arg > 1.0 will set mfact absolutly */
1480 void
1481 setmfact(const Arg *arg) {
1482         float f;
1483
1484         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1485                 return;
1486         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1487         if(f < 0.1 || f > 0.9)
1488                 return;
1489         selmon->mfact = f;
1490         arrange(selmon);
1491 }
1492
1493 void
1494 setup(void) {
1495         XSetWindowAttributes wa;
1496
1497         /* clean up any zombies immediately */
1498         sigchld(0);
1499
1500         /* init screen */
1501         screen = DefaultScreen(dpy);
1502         root = RootWindow(dpy, screen);
1503         initfont(font);
1504         sw = DisplayWidth(dpy, screen);
1505         sh = DisplayHeight(dpy, screen);
1506         bh = dc.h = dc.font.height + 2;
1507         updategeom();
1508         /* init atoms */
1509         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1510         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1511         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1512         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1513         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1514         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1515         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1516         /* init cursors */
1517         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1518         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1519         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1520         /* init appearance */
1521         dc.norm[ColBorder] = getcolor(normbordercolor);
1522         dc.norm[ColBG] = getcolor(normbgcolor);
1523         dc.norm[ColFG] = getcolor(normfgcolor);
1524         dc.sel[ColBorder] = getcolor(selbordercolor);
1525         dc.sel[ColBG] = getcolor(selbgcolor);
1526         dc.sel[ColFG] = getcolor(selfgcolor);
1527         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1528         dc.gc = XCreateGC(dpy, root, 0, NULL);
1529         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1530         if(!dc.font.set)
1531                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1532         /* init bars */
1533         updatebars();
1534         updatestatus();
1535         /* EWMH support per view */
1536         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1537                         PropModeReplace, (unsigned char *) netatom, NetLast);
1538         /* select for events */
1539         wa.cursor = cursor[CurNormal];
1540         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1541                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1542                         |PropertyChangeMask;
1543         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1544         XSelectInput(dpy, root, wa.event_mask);
1545         grabkeys();
1546 }
1547
1548 void
1549 showhide(Client *c) {
1550         if(!c)
1551                 return;
1552         if(ISVISIBLE(c)) { /* show clients top down */
1553                 XMoveWindow(dpy, c->win, c->x, c->y);
1554                 if(!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
1555                         resize(c, c->x, c->y, c->w, c->h, False);
1556                 showhide(c->snext);
1557         }
1558         else { /* hide clients bottom up */
1559                 showhide(c->snext);
1560                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1561         }
1562 }
1563
1564
1565 void
1566 sigchld(int unused) {
1567         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1568                 die("Can't install SIGCHLD handler");
1569         while(0 < waitpid(-1, NULL, WNOHANG));
1570 }
1571
1572 void
1573 spawn(const Arg *arg) {
1574         if(fork() == 0) {
1575                 if(dpy)
1576                         close(ConnectionNumber(dpy));
1577                 setsid();
1578                 execvp(((char **)arg->v)[0], (char **)arg->v);
1579                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1580                 perror(" failed");
1581                 exit(0);
1582         }
1583 }
1584
1585 void
1586 tag(const Arg *arg) {
1587         if(selmon->sel && arg->ui & TAGMASK) {
1588                 selmon->sel->tags = arg->ui & TAGMASK;
1589                 arrange(selmon);
1590         }
1591 }
1592
1593 void
1594 tagmon(const Arg *arg) {
1595         if(!selmon->sel || !mons->next)
1596                 return;
1597         sendmon(selmon->sel, dirtomon(arg->i));
1598 }
1599
1600 int
1601 textnw(const char *text, unsigned int len) {
1602         XRectangle r;
1603
1604         if(dc.font.set) {
1605                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1606                 return r.width;
1607         }
1608         return XTextWidth(dc.font.xfont, text, len);
1609 }
1610
1611 void
1612 tile(Monitor *m) {
1613         int x, y, h, w, mw;
1614         unsigned int i, n;
1615         Client *c;
1616
1617         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1618         if(n == 0)
1619                 return;
1620         /* master */
1621         c = nexttiled(m->clients);
1622         mw = m->mfact * m->ww;
1623         resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1624         if(--n == 0)
1625                 return;
1626         /* tile stack */
1627         x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1628         y = m->wy;
1629         w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1630         h = m->wh / n;
1631         if(h < bh)
1632                 h = m->wh;
1633         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1634                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1635                        ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1636                 if(h != m->wh)
1637                         y = c->y + HEIGHT(c);
1638         }
1639 }
1640
1641 void
1642 togglebar(const Arg *arg) {
1643         selmon->showbar = !selmon->showbar;
1644         updatebarpos(selmon);
1645         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1646         arrange(selmon);
1647 }
1648
1649 void
1650 togglefloating(const Arg *arg) {
1651         if(!selmon->sel)
1652                 return;
1653         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1654         if(selmon->sel->isfloating)
1655                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1656                        selmon->sel->w, selmon->sel->h, False);
1657         arrange(selmon);
1658 }
1659
1660 void
1661 toggletag(const Arg *arg) {
1662         unsigned int newtags;
1663
1664         if(!selmon->sel)
1665                 return;
1666         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1667         if(newtags) {
1668                 selmon->sel->tags = newtags;
1669                 arrange(selmon);
1670         }
1671 }
1672
1673 void
1674 toggleview(const Arg *arg) {
1675         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1676
1677         if(newtagset) {
1678                 selmon->tagset[selmon->seltags] = newtagset;
1679                 arrange(selmon);
1680         }
1681 }
1682
1683 void
1684 unfocus(Client *c) {
1685         if(!c)
1686                 return;
1687         grabbuttons(c, False);
1688         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1689         XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1690 }
1691
1692 void
1693 unmanage(Client *c, Bool destroyed) {
1694         Monitor *m = c->mon;
1695         XWindowChanges wc;
1696
1697         /* The server grab construct avoids race conditions. */
1698         detach(c);
1699         detachstack(c);
1700         if(!destroyed) {
1701                 wc.border_width = c->oldbw;
1702                 XGrabServer(dpy);
1703                 XSetErrorHandler(xerrordummy);
1704                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1705                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1706                 setclientstate(c, WithdrawnState);
1707                 XSync(dpy, False);
1708                 XSetErrorHandler(xerror);
1709                 XUngrabServer(dpy);
1710         }
1711         free(c);
1712         focus(NULL);
1713         arrange(m);
1714 }
1715
1716 void
1717 unmapnotify(XEvent *e) {
1718         Client *c;
1719         XUnmapEvent *ev = &e->xunmap;
1720
1721         if((c = wintoclient(ev->window)))
1722                 unmanage(c, False);
1723 }
1724
1725 void
1726 updatebars(void) {
1727         Monitor *m;
1728         XSetWindowAttributes wa;
1729
1730         wa.override_redirect = True;
1731         wa.background_pixmap = ParentRelative;
1732         wa.event_mask = ButtonPressMask|ExposureMask;
1733         for(m = mons; m; m = m->next) {
1734                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1735                                           CopyFromParent, DefaultVisual(dpy, screen),
1736                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1737                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1738                 XMapRaised(dpy, m->barwin);
1739         }
1740 }
1741
1742 void
1743 updatebarpos(Monitor *m) {
1744         m->wy = m->my;
1745         m->wh = m->mh;
1746         if(m->showbar) {
1747                 m->wh -= bh;
1748                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1749                 m->wy = m->topbar ? m->wy + bh : m->wy;
1750         }
1751         else
1752                 m->by = -bh;
1753 }
1754
1755 Bool
1756 updategeom(void) {
1757         Bool dirty = False;
1758
1759 #ifdef XINERAMA
1760         if(XineramaIsActive(dpy)) {
1761                 int i, j, n, nn;
1762                 Client *c;
1763                 Monitor *m;
1764                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1765                 XineramaScreenInfo *unique = NULL;
1766
1767                 info = XineramaQueryScreens(dpy, &nn);
1768                 for(n = 0, m = mons; m; m = m->next, n++);
1769                 /* only consider unique geometries as separate screens */
1770                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1771                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1772                 for(i = 0, j = 0; i < nn; i++)
1773                         if(isuniquegeom(unique, j, &info[i]))
1774                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1775                 XFree(info);
1776                 nn = j;
1777                 if(n <= nn) {
1778                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1779                                 for(m = mons; m && m->next; m = m->next);
1780                                 if(m)
1781                                         m->next = createmon();
1782                                 else
1783                                         mons = createmon();
1784                         }
1785                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1786                                 if(i >= n
1787                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1788                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1789                                 {
1790                                         dirty = True;
1791                                         m->num = i;
1792                                         m->mx = m->wx = unique[i].x_org;
1793                                         m->my = m->wy = unique[i].y_org;
1794                                         m->mw = m->ww = unique[i].width;
1795                                         m->mh = m->wh = unique[i].height;
1796                                         updatebarpos(m);
1797                                 }
1798                 }
1799                 else { /* less monitors available nn < n */
1800                         for(i = nn; i < n; i++) {
1801                                 for(m = mons; m && m->next; m = m->next);
1802                                 while(m->clients) {
1803                                         dirty = True;
1804                                         c = m->clients;
1805                                         m->clients = c->next;
1806                                         detachstack(c);
1807                                         c->mon = mons;
1808                                         attach(c);
1809                                         attachstack(c);
1810                                 }
1811                                 if(m == selmon)
1812                                         selmon = mons;
1813                                 cleanupmon(m);
1814                         }
1815                 }
1816                 free(unique);
1817         }
1818         else
1819 #endif /* XINERAMA */
1820         /* default monitor setup */
1821         {
1822                 if(!mons)
1823                         mons = createmon();
1824                 if(mons->mw != sw || mons->mh != sh) {
1825                         dirty = True;
1826                         mons->mw = mons->ww = sw;
1827                         mons->mh = mons->wh = sh;
1828                         updatebarpos(mons);
1829                 }
1830         }
1831         if(dirty) {
1832                 selmon = mons;
1833                 selmon = wintomon(root);
1834         }
1835         return dirty;
1836 }
1837
1838 void
1839 updatenumlockmask(void) {
1840         unsigned int i, j;
1841         XModifierKeymap *modmap;
1842
1843         numlockmask = 0;
1844         modmap = XGetModifierMapping(dpy);
1845         for(i = 0; i < 8; i++)
1846                 for(j = 0; j < modmap->max_keypermod; j++)
1847                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1848                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1849                                 numlockmask = (1 << i);
1850         XFreeModifiermap(modmap);
1851 }
1852
1853 void
1854 updatesizehints(Client *c) {
1855         long msize;
1856         XSizeHints size;
1857
1858         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1859                 /* size is uninitialized, ensure that size.flags aren't used */
1860                 size.flags = PSize;
1861         if(size.flags & PBaseSize) {
1862                 c->basew = size.base_width;
1863                 c->baseh = size.base_height;
1864         }
1865         else if(size.flags & PMinSize) {
1866                 c->basew = size.min_width;
1867                 c->baseh = size.min_height;
1868         }
1869         else
1870                 c->basew = c->baseh = 0;
1871         if(size.flags & PResizeInc) {
1872                 c->incw = size.width_inc;
1873                 c->inch = size.height_inc;
1874         }
1875         else
1876                 c->incw = c->inch = 0;
1877         if(size.flags & PMaxSize) {
1878                 c->maxw = size.max_width;
1879                 c->maxh = size.max_height;
1880         }
1881         else
1882                 c->maxw = c->maxh = 0;
1883         if(size.flags & PMinSize) {
1884                 c->minw = size.min_width;
1885                 c->minh = size.min_height;
1886         }
1887         else if(size.flags & PBaseSize) {
1888                 c->minw = size.base_width;
1889                 c->minh = size.base_height;
1890         }
1891         else
1892                 c->minw = c->minh = 0;
1893         if(size.flags & PAspect) {
1894                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1895                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1896         }
1897         else
1898                 c->maxa = c->mina = 0.0;
1899         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1900                      && c->maxw == c->minw && c->maxh == c->minh);
1901 }
1902
1903 void
1904 updatetitle(Client *c) {
1905         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1906                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1907         if(c->name[0] == '\0') /* hack to mark broken clients */
1908                 strcpy(c->name, broken);
1909 }
1910
1911 void
1912 updatestatus(void) {
1913         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1914                 strcpy(stext, "dwm-"VERSION);
1915         drawbar(selmon);
1916 }
1917
1918 void
1919 updatewmhints(Client *c) {
1920         XWMHints *wmh;
1921
1922         if((wmh = XGetWMHints(dpy, c->win))) {
1923                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1924                         wmh->flags &= ~XUrgencyHint;
1925                         XSetWMHints(dpy, c->win, wmh);
1926                 }
1927                 else
1928                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1929                 XFree(wmh);
1930         }
1931 }
1932
1933 void
1934 view(const Arg *arg) {
1935         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1936                 return;
1937         selmon->seltags ^= 1; /* toggle sel tagset */
1938         if(arg->ui & TAGMASK)
1939                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1940         arrange(selmon);
1941 }
1942
1943 Client *
1944 wintoclient(Window w) {
1945         Client *c;
1946         Monitor *m;
1947
1948         for(m = mons; m; m = m->next)
1949                 for(c = m->clients; c; c = c->next)
1950                         if(c->win == w)
1951                                 return c;
1952         return NULL;
1953 }
1954
1955 Monitor *
1956 wintomon(Window w) {
1957         int x, y;
1958         Client *c;
1959         Monitor *m;
1960
1961         if(w == root && getrootptr(&x, &y))
1962                 return ptrtomon(x, y);
1963         for(m = mons; m; m = m->next)
1964                 if(w == m->barwin)
1965                         return m;
1966         if((c = wintoclient(w)))
1967                 return c->mon;
1968         return selmon;
1969 }
1970
1971 /* There's no way to check accesses to destroyed windows, thus those cases are
1972  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1973  * default error handler, which may call exit.  */
1974 int
1975 xerror(Display *dpy, XErrorEvent *ee) {
1976         if(ee->error_code == BadWindow
1977         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1978         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1979         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1980         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1981         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1982         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1983         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1984         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1985                 return 0;
1986         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1987                         ee->request_code, ee->error_code);
1988         return xerrorxlib(dpy, ee); /* may call exit */
1989 }
1990
1991 int
1992 xerrordummy(Display *dpy, XErrorEvent *ee) {
1993         return 0;
1994 }
1995
1996 /* Startup Error handler to check if another window manager
1997  * is already running. */
1998 int
1999 xerrorstart(Display *dpy, XErrorEvent *ee) {
2000         otherwm = True;
2001         return -1;
2002 }
2003
2004 void
2005 zoom(const Arg *arg) {
2006         Client *c = selmon->sel;
2007
2008         if(!selmon->lt[selmon->sellt]->arrange
2009         || selmon->lt[selmon->sellt]->arrange == monocle
2010         || (selmon->sel && selmon->sel->isfloating))
2011                 return;
2012         if(c == nexttiled(selmon->clients))
2013                 if(!c || !(c = nexttiled(c->next)))
2014                         return;
2015         detach(c);
2016         attach(c);
2017         focus(c);
2018         arrange(c->mon);
2019 }
2020
2021 int
2022 main(int argc, char *argv[]) {
2023         if(argc == 2 && !strcmp("-v", argv[1]))
2024                 die("dwm-"VERSION", © 2006-2010 dwm engineers, see LICENSE for details\n");
2025         else if(argc != 1)
2026                 die("usage: dwm [-v]\n");
2027         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2028                 fputs("warning: no locale support\n", stderr);
2029         if(!(dpy = XOpenDisplay(NULL)))
2030                 die("dwm: cannot open display\n");
2031         checkotherwm();
2032         setup();
2033         scan();
2034         run();
2035         cleanup();
2036         XCloseDisplay(dpy);
2037         return 0;
2038 }